Protesters break into the building of the regional governor's office in Lviv, Western Ukraine, Thursday Jan. 23, 2014. Tensions in Ukraine spread far from its embattled capital on Thursday as hundreds of people in the city of Lviv stormed into the regional governor's office and forced him to write a letter of resignation. (AP Photo/Pavlo Palamarchuk) ORG XMIT: XEL111

Protesters break into the building of the regional governor's...

A protester throws tires onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG117

A protester throws tires onto a fire during a clash with police in...

Priests of different faiths pray during clashes with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG108

Priests of different faiths pray during clashes with police in...

Protesters use a large slingshot to hurl a Molotov cocktail at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG101

Protesters use a large slingshot to hurl a Molotov cocktail at...

A protester throws tyres onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG113

A protester throws tyres onto a fire during a clash with police in...

A protester walks pass burning tyres in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG104

A protester walks pass burning tyres in central Kiev, Ukraine,...

A protester breaks up a mannequin on the roof of the burned truck during clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG105

A protester breaks up a mannequin on the roof of the burned truck...

A protester stands at a burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky) ORG XMIT: XEL109

A protester stands at a burning barricades between police and...

A Kiev resident looks at burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky) ORG XMIT: XEL108

A Kiev resident looks at burning barricades between police and...

Protesters aim fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits) ORG XMIT: XSG111

Protesters aim fireworks at police during clashes, in central Kiev,...

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky) ORG XMIT: XEL110